// Get the toolkit version of this pen for a specific toolkit.
internal IToolkitPen GetPen(IToolkit toolkit)
{
lock (this)
{
if (toolkitPen == null)
{
// We don't yet have a toolkit pen yet.
toolkitPen = toolkit.CreatePen(this);
this.toolkit = toolkit;
return(toolkitPen);
}
else if (this.toolkit == toolkit)
{
// Same toolkit - return the cached pen information.
return(toolkitPen);
}
else
{
// We have a pen for another toolkit,
// so dispose it and create for this toolkit.
// We null out "toolkitPen" before calling
// "CreatePen()" just in case an exception
// is thrown while creating the toolkit pen.
toolkitPen.Dispose();
toolkitPen = null;
toolkitPen = toolkit.CreatePen(this);
this.toolkit = toolkit;
return(toolkitPen);
}
}
}
// Dispose of this pen.
public void Dispose()
{
lock (this)
{
if (toolkitPen != null)
{
toolkitPen.Dispose();
toolkitPen = null;
}
toolkit = null;
if (brush != null)
{
brush.Modified();
}
}
}
// Dispose of this pen.
public void Dispose()
{
if (_disposed)
{
return;
}
lock (this)
{
_disposed = true;
if (toolkitPen != null)
{
toolkitPen.Dispose();
toolkitPen = null;
}
toolkit = null;
if (brush != null)
{
brush.Modified();
}
}
}
// Get the toolkit version of this pen for a specific toolkit.
internal IToolkitPen GetPen(IToolkit toolkit)
{
lock(this)
{
if(this.toolkitPen == null)
{
// We don't yet have a toolkit pen yet.
this.toolkitPen = toolkit.CreatePen(this);
this.toolkit = toolkit;
return this.toolkitPen;
}
else if(this.toolkit == toolkit)
{
// Same toolkit - return the cached pen information.
return this.toolkitPen;
}
else
{
// We have a pen for another toolkit,
// so dispose it and create for this toolkit.
// We null out "toolkitPen" before calling
// "CreatePen()" just in case an exception
// is thrown while creating the toolkit pen.
this.toolkitPen.Dispose();
this.toolkitPen = null;
this.toolkitPen = toolkit.CreatePen(this);
this.toolkit = toolkit;
return this.toolkitPen;
}
}
}
// Dispose of this pen.
public void Dispose()
{
lock(this)
{
if(toolkitPen != null)
{
toolkitPen.Dispose();
toolkitPen = null;
}
toolkit = null;
if(brush != null)
{
brush.Modified();
}
}
}
// Draw a line between two points using the current pen.
// Fast version of Bresenham's algorithm.
public override void DrawLine(int x1, int y1, int x2, int y2)
{
IToolkitPen pen = Pen;
ToolkitPenBase penBase;
if (pen == null)
return;
penBase = pen as ToolkitPenBase;
int color = penBase.Color.ToArgb();
Frame frame = image.image.GetFrame(0);
// TODO: Finish off
int dy = y2 - y1;
int dx = x2 - x1;
int stepx, stepy;
if (dy < 0)
{
dy = -dy;
stepy = -frame.Stride;
}
else
stepy = frame.Stride;
if (dx < 0)
{
dx = -dx;
stepx = -1;
}
else
{
stepx = 1;
}
dy <<= 1;
dx <<= 1;
y1 *= frame.Stride;
y2 *= frame.Stride;
SetPixelLine(frame, x1,y1, color);
if (dx > dy)
{
int fraction = dy - (dx >> 1);
while (x1 != x2)
{
if (fraction >= 0)
{
y1 += stepy;
fraction -= dx;
}
x1 += stepx;
fraction += dy;
SetPixelLine(frame, x1,y1, color);
}
}
else
{
int fraction = dx - (dy >> 1);
while (y1 != y2)
{
if (fraction >= 0)
{
x1 += stepx;
fraction -= dy;
}
y1 += stepy;
fraction += dx;
SetPixelLine(frame, x1,y1, color);
}
}
this.image.ImageChanged();
}
